Picture the Earth as one giant puzzle, spinning slowly in space. The pieces are made of land and water — seven big chunks of land we call continents, and a few enormous stretches of water we call oceans. Let's meet them, one by one.

First, the giant of them all: Asia. It's the biggest continent by a mile, home to more people than anywhere else and packed with everything from snowy mountains to steamy jungles. If the continents were siblings, Asia would be the tall one who eats most of the cereal.

Next door sits Africa, the second-largest. It straddles the equator like a warm belt around the planet, so much of it stays toasty all year. It holds the world's longest river and a desert big enough to swallow whole countries.

Then come North America and South America, two continents stacked like a tall scoop and a shorter scoop on the same ice cream cone, joined by a thin strip of land. North America has icy north and cozy south; South America wears a giant green rainforest like a leafy jacket.

Hop across the water to Antarctica — the frozen one at the very bottom of the globe. It's almost entirely ice, colder than your freezer's wildest dreams, and home mostly to penguins and scientists in very puffy coats.

Now meet Europe, smallish but mighty, tucked beside Asia like a roommate who never quite moved out. And far away in the south sits Australia — a whole continent that's also a single country, full of bouncing kangaroos and red, sunbaked earth.

That's all seven! Asia, Africa, North America, South America, Antarctica, Europe, and Australia. Now wiggle your fingers, because the rest of the planet — most of it, actually — is water. Welcome to the oceans.

The biggest is the Pacific Ocean, so huge it could hold every continent inside it with room to splash. Beside it, the Atlantic Ocean swings between the Americas and Europe-Africa like a giant blue hammock. And warm and dreamy near the equator lies the Indian Ocean.

At the chilly ends of the Earth wait two more: the Arctic Ocean, capped with floating ice at the top, and the Southern Ocean, swirling all the way around Antarctica at the bottom. Together, the five oceans are really one connected world-sea — water that loops the entire planet.

So there it is: seven puzzle pieces of land floating in five great oceans, all part of one spinning blue marble. Next time you look at a globe, give it a little turn — and remember, most of your home planet is, gloriously, ocean.